| 摘要 |
<p>PURPOSE:To conduct high-accuracy transmission power control with high responsiveness by decoding only the transmission power connecting bit in a short period while using a simplified viterbi decoder, and controlling the transmission power based on this decoded result. CONSTITUTION:A received digital signal outputted from a reception radio part 12 is demodulated by a demodulating part 14 after diffusion is removed by an inverse diffusing part 13. The demodulated received signal is distributed to two systems. The received signal of the first system is decoded by a normal viterbi decoder 15 equipped with a path memory with and about five times restrict length. The received signal of the second system is decoded by a simplified viterbi decoder 16 equipped with a path memory of which the memory length is shorter. As an information data signal, the output of the normal viterbi decoder 15 is used. On the other hand, the transmission power control is performed while using the transmission power control bit of the signal decoded by the simplified viterbi decoder 16. A transmission power control bit extracting part 17 extracts the transmission power control bit from the signal decoded by the simplified viterbi decoder 16.</p> |
